Q1 of 40 Page 1

The HCF and the LCM of 12, 21,15 respectively are

12 = 22 × 3

21 = 7 × 3 H.C.F. = 3


15 = 5 × 3 L.C.M. = 24 × 7 × 5 = × 3 = 420

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